Analysis of in situ rapid solidification of submicron Al-Ge eutectic powders using transmission electron microscopy

Journal Article · Fri Apr 01 00:00:00 EST 1983 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02643778· OSTI ID:5581833

Kaufman, M J; Fraser, H L

Submicron powders of Al-30.3 at. pct Ge (eutectic), produced by electrohydrodynamic atomization, have been analyzed in a transmission electron microscope operating at 120 kV. Amorphous and complex crystalline structures were observed in the as-atomized condition. By using the electron beam as a local heating source, powders could be either annealed at temperatures below their melting point or melted. Molten powders were quenched at various cooling rates by altering the rate of beam obstruction. Using this technique, nonequilibrium structures were produced including metastable phases and mixed amorphous/crystalline microstructures. These various structures have been related to cooling rates and compared to the as-atomized structures. Crystallization of the amorphous regions produced by this technique has also been studied.

• Research Organization: Department of Metallurgy and the Materials Research Laboratory at the University of Illinois, Urbana, IL 61801
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5581833
• Journal Information: Metall. Trans., A; (United States), Vol. 14A
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CRYSTALLIZATION
SOLIDIFICATION
GERMANIUM ALLOYS
AMORPHOUS STATE
ANNEALING
ATOMIZATION
BEAM INJECTION HEATING
CRYSTAL STRUCTURE
ELECTROHYDRODYNAMICS
ELECTRON BEAMS
EUTECTICS
IN-SITU PROCESSING
POWDER METALLURGY
POWDERS
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
BEAMS
ELECTRON MICROSCOPY
FLUID MECHANICS
HEAT TREATMENTS
HEATING
HYDRODYNAMICS
LEPTON BEAMS
MECHANICS
METALLURGY
MICROSCOPY
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PLASMA HEATING
PROCESSING
360102* - Metals & Alloys- Structure & Phase Studies